(19)

(11)

EP 0 601 027 A1

(12)

(43) Date of publication: 15.06.1994 Bulletin 1994/24 (21) Application number: 92918483.0 (22) Date of filing: 19.08.1992

(51) International Patent Classification (IPC):  C22B 3/ 14( . ) C22B 34/ 12( . ) (86) International application number: PCT/AU1992/000435 (87) International publication number: WO 1993/004206 (04.03.1993 Gazette 1993/06)

(84) Designated Contracting States: DE ES FR GB IT NL (30) Priority: 19.08.1991 AU 19910007799 02.04.1992 AU 19920001653 (71) Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Campbell, Australian Capital Territory 2601 (AU)	(72) Inventors: TURNEY, Terence William Malvern East, VIC 3145 (AU) HOANG, Manh South Clayton, VIC 3169 (AU) (74) Representative: Perry, Robert Edward, et al  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)